--- title: Kickbox Reviews meta\_title: 'Kickbox Reviews 2026: Details, Pricing, & Features | G2' meta\_description: Filter 658 reviews by the users' company size, role or industry to find out how Kickbox works for a business like yours. aggregate\_rating: rating\_value: 4.5 review\_count: 658 scale: '5' date\_modified: '2026-08-09' parent\_category: name: Collaboration & Productivity url: https://www.g2.com/categories/collaboration-productivity --- ### Kickbox Pros and Cons: Top 5 Advantages and Disadvantages #### Quick AI Summary Based on G2 Reviews Generated from real user reviews Users value the **ease of use** of Kickbox, appreciating its simplicity and seamless integration for non-tech users. [(129 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897570&qs=pros-and-cons#reviews) Users value the **efficient email verification** of Kickbox, ensuring only deliverable contacts for effective marketing. [(49 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897750&qs=pros-and-cons#reviews) Users appreciate the **user-friendly interface** of Kickbox, which makes list uploading and validation quick and easy. [(45 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897723&qs=pros-and-cons#reviews) Users appreciate the **easy setup** of Kickbox, enabling quick list clean-up and improved email deliverability. [(40 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897235&qs=pros-and-cons#reviews) Users praise Kickbox for its **amazing data accuracy** , highlighting clear results that enhance usability and efficiency. [(39 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897286&qs=pros-and-cons#reviews) Users find Kickbox to be **too expensive** and prefer more affordable pricing options or a subscription model. [(25 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897580&qs=pros-and-cons#reviews) Users find the **insufficient information** on risky emails frustrating, impacting their ability to make informed decisions. [(13 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897248&qs=pros-and-cons#reviews) Users express concerns about **data accuracy** in Kickbox, noting issues with 'risky' statuses and hard bounces. [(11 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897435&qs=pros-and-cons#reviews) Users note that **improvement is needed** as Kickbox misses disposable domains and lacks detailed reporting explanations. [(11 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897532&qs=pros-and-cons#reviews) Users express concerns about **missing information** regarding email classifications and lack of insights for better decision-making. [(10 mentions)](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897459&qs=pros-and-cons#reviews) ### 5 Pros or Advantages of Kickbox ##### 1. Ease of Use Users value the **ease of use** of Kickbox, appreciating its simplicity and seamless integration for non-tech users. [ See 129 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897570&qs=pros-and-cons#reviews) See Related User Reviews ![Camila K.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Camila K.") CK Camila K. Small-Business (50 or fewer emp.) 4.5/5 "Essential for Reliable Email Deliverability" What do you like about Kickbox? I like using Kickbox for email verification. It quickly helps me identify which emails are legitimate and which ones might bounce, significantly impro EG Everett G. Small-Business (50 or fewer emp.) 4.0/5 "Super Easy to Use" What do you like about Kickbox? Kickbox allows you to upload lists, then segment and validate them super easily with a really friendly interface. ##### 2. Email Verification Users value the **efficient email verification** of Kickbox, ensuring only deliverable contacts for effective marketing. [ See 49 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897750&qs=pros-and-cons#reviews) See Related User Reviews ![Camila K.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Camila K.") CK Camila K. Small-Business (50 or fewer emp.) 4.5/5 "Essential for Reliable Email Deliverability" What do you like about Kickbox? I like using Kickbox for email verification. It quickly helps me identify which emails are legitimate and which ones might bounce, significantly impro ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Small-Business (50 or fewer emp.) 5.0/5 "Great platform that has reduced spam sign ups on our site and is good value for money" What do you like about Kickbox? Being able to check if a user is using a real email address that is deliverable and also its great for us to identify if somebody is trying to registe ##### 3. User Interface Users appreciate the **user-friendly interface** of Kickbox, which makes list uploading and validation quick and easy. [ See 45 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897723&qs=pros-and-cons#reviews) See Related User Reviews ![Camila K.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Camila K.") CK Camila K. Small-Business (50 or fewer emp.) 4.5/5 "Essential for Reliable Email Deliverability" What do you like about Kickbox? I like using Kickbox for email verification. It quickly helps me identify which emails are legitimate and which ones might bounce, significantly impro EG Everett G. Small-Business (50 or fewer emp.) 4.0/5 "Super Easy to Use" What do you like about Kickbox? Kickbox allows you to upload lists, then segment and validate them super easily with a really friendly interface. ##### 4. Easy Setup Users appreciate the **easy setup** of Kickbox, enabling quick list clean-up and improved email deliverability. [ See 40 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897235&qs=pros-and-cons#reviews) See Related User Reviews ![Camila K.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Camila K.") CK Camila K. Small-Business (50 or fewer emp.) 4.5/5 "Essential for Reliable Email Deliverability" What do you like about Kickbox? I like using Kickbox for email verification. It quickly helps me identify which emails are legitimate and which ones might bounce, significantly impro ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Small-Business (50 or fewer emp.) 5.0/5 "Great platform that has reduced spam sign ups on our site and is good value for money" What do you like about Kickbox? Being able to check if a user is using a real email address that is deliverable and also its great for us to identify if somebody is trying to registe ##### 5. Accuracy Users praise Kickbox for its **amazing data accuracy** , highlighting clear results that enhance usability and efficiency. [ See 39 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897286&qs=pros-and-cons#reviews) See Related User Reviews ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") U Verified User Mid-Market (51-1000 emp.) 4.5/5 "Easy to Use Validation That Gets the Job Done" What do you like about Kickbox? Easy to use, and seems to do a good job at validation ![David P.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "David P.") DP David P. Small-Business (50 or fewer emp.) 4.5/5 "Easy Integration and Great at Catching Typos & Undeliverable Emails" What do you like about Kickbox? It was very easy to integrate, and it does a really good job of weeding out typos and undeliverable addresses. ### 5 Cons or Disadvantages of Kickbox ##### 1. Expensive Users find Kickbox to be **too expensive** and prefer more affordable pricing options or a subscription model. [ See 25 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897580&qs=pros-and-cons#reviews) See Related User Reviews ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Small-Business (50 or fewer emp.) 5.0/5 "Great platform that has reduced spam sign ups on our site and is good value for money" What do you dislike about Kickbox? nothing we find the service perfect for our needs and response times on the API are already good. ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") U Verified User Small-Business (50 or fewer emp.) 5.0/5 "Great, but very expensive..." What do you dislike about Kickbox? It's a bit too expensive, and is a bit out of my price range to be hoenst. I cant get it sustainably. ##### 2. Insufficient Information Users find the **insufficient information** on risky emails frustrating, impacting their ability to make informed decisions. [ See 13 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897248&qs=pros-and-cons#reviews) See Related User Reviews ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Mid-Market (51-1000 emp.) 3.5/5 "Fast Verification but Beware of false Failures" What do you dislike about Kickbox? I come across false failures too frequently with Kickbox, and I haven't been able to get much detail on the reason why these failures occur since ques ![David P.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "David P.") DP David P. Small-Business (50 or fewer emp.) 4.5/5 "Easy Integration and Great at Catching Typos & Undeliverable Emails" What do you dislike about Kickbox? The dashboard doesn't give a bunch of information. It's very simple, which is nice for a general understanding, but I would like to be able to get dow ##### 3. Data Accuracy Users express concerns about **data accuracy** in Kickbox, noting issues with 'risky' statuses and hard bounces. [ See 11 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897435&qs=pros-and-cons#reviews) See Related User Reviews ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Small-Business (50 or fewer emp.) 3.0/5 "Great Value for Pre-Send Email Validation with Better Data Visualization" What do you dislike about Kickbox? I thought I was prepared to send my email, but it turns out, we still had 12 hard bounces after I ran all of out emails through Kickbox. We only have ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") U Verified User Mid-Market (51-1000 emp.) 4.5/5 "Easy to Use Validation That Gets the Job Done" What do you dislike about Kickbox? Often get lots of unknowns where in reality some are valid and some are undeliverable. ##### 4. Improvement Needed Users note that **improvement is needed** as Kickbox misses disposable domains and lacks detailed reporting explanations. [ See 11 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897532&qs=pros-and-cons#reviews) See Related User Reviews ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Mid-Market (51-1000 emp.) 3.5/5 "Fast Verification but Beware of false Failures" What do you dislike about Kickbox? I come across false failures too frequently with Kickbox, and I haven't been able to get much detail on the reason why these failures occur since ques ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") A Verified User Enterprise (\> 1000 emp.) 3.5/5 "Great List Cleaning and Email Verification, with Handy Real-Time API Tools" What do you dislike about Kickbox? Spam detection isn’t always definitive, Support can be slow ##### 5. Missing Information Users express concerns about **missing information** regarding email classifications and lack of insights for better decision-making. [ See 10 mentions ](https://www.g2.com/products/kickbox/reviews?filters%5Bsentiment_snippet%5D=1897459&qs=pros-and-cons#reviews) See Related User Reviews ![David P.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "David P.") DP David P. Small-Business (50 or fewer emp.) 4.5/5 "Easy Integration and Great at Catching Typos & Undeliverable Emails" What do you dislike about Kickbox? The dashboard doesn't give a bunch of information. It's very simple, which is nice for a general understanding, but I would like to be able to get dow ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") U Verified User Small-Business (50 or fewer emp.) 3.5/5 "User-Friendly Setup, But Step-by-Step Guides Need More Depth" What do you dislike about Kickbox? not many step by step guides that cover a variety of situations (had to look at external sources for questions about zapier) ![Jake O.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Jake O.") JO Jake O. Small-Business (50 or fewer emp.) 4/29/2026 "Fast Verification, Smooth HubSpot Integration" 5/5 What do you like best about Kickbox? I love how quickly the verification process works with Kickbox. The HubSpot integration is very smooth, which makes it great for my use. It clears the way for my business to get to verified people and ensures that my messages are being sent into inboxes correctly. Kickbox was the first verification tool we've used, and we love it. The setup was super easy, and I just love Kickbox! Review collected by and hosted on G2.com. What do you dislike about Kickbox? If there was a way to see the risky or unknown emails of the verification that would be very helpful. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? I use Kickbox for email verification, identifying good or bad emails to reach out to. It ensures my messages reach verified inboxes correctly. I love the quick verification process and the smooth integration with HubSpot. Review collected by and hosted on G2.com. Show More Validated ReviewerIncentivizedSource: Seller invite ![Verified User in Non-Profit Organization Management](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User in Non-Profit Organization Management") AN Verified User in Non-Profit Organization Management Small-Business (50 or fewer emp.) 2/24/2026 "Great Value for Pre-Send Email Validation with Better Data Visualization" 3/5 What do you like best about Kickbox? Decreasing the number of emails with bad addresses in our org. Review collected by and hosted on G2.com. What do you dislike about Kickbox? I thought I was prepared to send my email, but it turns out, we still had 12 hard bounces after I ran all of out emails through Kickbox. We only have 247 contacts, and I was only emailing 80, so 12 is HUGE. On the up side, it was cheaper than Never Bounce, and I think the visualization of the data I got back was better. But there were a lot of emails that were unconfirmed. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? We just needed to make sure we weren't going to have a high bounce rate right out of the gate. We were inputting some older data from the last 3 years into Salesforce, and I know people move around a lot, so we wanted to be sure we aren't emailing bad addresses. I felt pretty good about it when I ran the data through Kickbox, but clearly, the unconfirmed emails were bad. Review collected by and hosted on G2.com. Show More Current UserValidated ReviewerIncentivizedSource: Seller invite ![Martin B.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Martin B.") MB Martin B. COO Small-Business (50 or fewer emp.) 7/13/2026 "Accurate Results That Made Lead List Sanitization Easy" 5/5 What do you like best about Kickbox? I really liked the accuracy of the results and that It helped me sanitize my lead list. Review collected by and hosted on G2.com. What do you dislike about Kickbox? There was nothing that I would disliked. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? Kickbox is the best platform available to clean my email list before I upload it to my email marketing software. Review collected by and hosted on G2.com. Show More Current UserValidated ReviewerIncentivizedSource: Seller invite ![Jonathan C.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Jonathan C.") JC Jonathan C. Manager - Business Development & Engineering Small-Business (50 or fewer emp.) 7/27/2026 "Easy Email Verification with Seamless Integration" 4.5/5 What do you like best about Kickbox? I like that Kickbox was easy to use and fast, which made it convenient for my tasks. Also, its integration was pretty nice as it made my email campaign easier by reducing rejected emails. Review collected by and hosted on G2.com. What do you dislike about Kickbox? Maybe the ease of use was not great at the start, but I figured it out. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? I find Kickbox verifies emails for me, integrates well with my platform, and makes my email campaigns easier while reducing rejected emails. Review collected by and hosted on G2.com. Show More Validated ReviewerIncentivizedSource: Seller invite ![Emily H.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Emily H.") EH Emily H. Digital Marketing Specialist Small-Business (50 or fewer emp.) 2/18/2026 "Essential for Email Deliverability, Easy to Use" 5/5 What do you like best about Kickbox? I use Kickbox to scan lists for deliverability before importing them into HubSpot. I appreciate that it identifies potential deliverability issues, which helps me keep my bounce rates down on my marketing emails by avoiding sending to addresses that would bounce. I find it easy to use, and I like the clear classification and explanations. Contacts are classified into different levels of riskiness regarding deliverability, and the reasons are explained, which I find helpful. Additionally, the initial setup of Kickbox was very easy. Review collected by and hosted on G2.com. What do you dislike about Kickbox? The integration with HubSpot is not very useful. Currently, it can pull in lists from HubSpot, but I don't need to scan these contacts, I will have done so before they entered the platform. What I would like to do is be able to send new contact lists into HubSpot from Kickbox as an import. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? I use Kickbox to scan lists for deliverability, identifying potential issues to keep my email bounce rates down. Review collected by and hosted on G2.com. Show More Validated ReviewerIncentivizedSource: G2 invite on behalf of seller EG Everett G. Co-Founder & CEO Small-Business (50 or fewer emp.) 1/13/2025 "Super Easy to Use" 4/5 What do you like best about Kickbox? Kickbox allows you to upload lists, then segment and validate them super easily with a really friendly interface. Review collected by and hosted on G2.com. What do you dislike about Kickbox? AI has things moving so fast, tough to tell who is ahead and who is behind Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? We took a brief hiatus while we re-wrote some of our codebase, and as we re-launched Kickbox helped us validate emails to ensure deliverability after a brief down period. Review collected by and hosted on G2.com. Show More 5/27/2026 Current UserValidated ReviewerIncentivizedSource: G2 invite on behalf of seller ![Ray S.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Ray S.") RS Ray S. Golf Instructor Mid-Market (51-1000 emp.) 7/22/2026 "Easy Email Verification, Great Stats, User-Friendly" 5/5 What do you like best about Kickbox? Easy email verification and good stats, easy to use UI Review collected by and hosted on G2.com. What do you dislike about Kickbox? It does what I need it to do, no complaints Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? helps save me time by only sending emails to addresses that are active. Review collected by and hosted on G2.com. Show More Current UserValidated ReviewerIncentivizedSource: Seller invite SS Salesforce S. 2/11/2026 "Effortless Email Verification, Reliable Results" 4.5/5 What do you like best about Kickbox? I appreciate Kickbox's simplicity and accuracy. The interface is easy to use, and the verification results are reliable. The real-time validation is very helpful for preventing bad email entries. It's a smooth, hassle-free tool that just works. The initial setup was very easy, and everything felt intuitive, so we were up and running quickly. We use Kickbox with Salesforce and HubSpot, which helps maintain accurate records, reduce bounce rates, and improve email deliverability. Review collected by and hosted on G2.com. What do you dislike about Kickbox? One thing that could be improved is the consistency of the verification results. Occasionally, when I rerun the same email address, Kickbox returns different outcomes, which can make it a bit confusing. Improving result stability and accuracy would make the tool even more reliable. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? I use Kickbox for Salesforce contacts email verification to reduce bounce rates, maintain a healthy email list, and prevent fake email entries. It identifies and removes risky email addresses, improves email deliverability, and is a reliable tool when integrated with platforms like Salesforce and HubSpot. Review collected by and hosted on G2.com. Show More Validated ReviewerIncentivizedSource: Seller invite ![Verified User](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User") G Verified User Small-Business (50 or fewer emp.) 7/16/2026 "User-Friendly but Sometimes Overly Cautious" 4/5 What do you like best about Kickbox? I really like Kickbox because it's a simple, easy-to-use platform. It's very simple to navigate, which is great when I'm trying to get prices. The intuitive UI makes my life easier, and I appreciate the great pricing. Review collected by and hosted on G2.com. What do you dislike about Kickbox? I think sometimes it's a little too stringent in its review. When it doesn't know, it kinda disallows, and that's annoying, especially when you're dealing with a big list. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? I use Kickbox to help with email verification for my marketing lists. I find it simple and easy to use, straightforward to navigate, and it offers great pricing. However, I sometimes find it too stringent in its reviews, which can be annoying with large lists. Review collected by and hosted on G2.com. Show More Validated ReviewerIncentivizedSource: G2 invite on behalf of seller ![Brian B.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Brian B.") BB Brian B. Senior Marketing Manager 12/11/2025 "Effortless Email List Clean-Up with Kickbox" 5/5 What do you like best about Kickbox? I use Kickbox to cleanse my email lists, ensuring my newsletters are sent without interruption. It's simple to use and provides quick results, which I find incredibly valuable. With Kickbox, I've been able to increase my newsletter delivery rates and keep my system from locking up due to too many invalid address sends. I've used it for both large and smaller lists, and it's a convenient tool, especially when dealing with lists that might not have solid contact info. When I first started, I inherited a poorly maintained customer email list and Kickbox helped me quickly cleanse it, eliminating issues with account lockouts and helping me maintain a 99% delivery rate. The initial setup was very easy, and I was able to integrate it with my HubSpot database seamlessly. I also like that I can rely on it to ensure that emails reach the right recipients and maintain high delivery rates. Review collected by and hosted on G2.com. What do you dislike about Kickbox? I can't say I have many complaints. I didn't realize there was a whole 'Understanding Results' section and this could have been helpful to know sooner if I knew where to look. Perhaps make it easier to find on the site or as a pop-up option, like a tutorial. Review collected by and hosted on G2.com. What problems is Kickbox solving and how is that benefiting you? I use Kickbox to cleanse my email lists, boosting my newsletter delivery rate to 99% and preventing account lockouts from invalid addresses. Review collected by and hosted on G2.com. 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